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Astron. Astrophys. 354, 229-235 (2000)

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Modeling the spectrum of V4334 Sgr (Sakurai's object)

Ya.V. Pavlenko 1, L.A. Yakovina 1 and H.W. Duerbeck 2

1 Main Astronomical Observatory of Academy of Sciences of Ukraine, Golosiiv woods, Kyiv-127, 03680 Ukraine (yp@mao.kiev.ua)
2 WE/OBSS, Free University Brussels (VUB), Pleinlaan 2, 1050 Brussels, Belgium (hduerbec@vub.ac.be)

Received 12 August 1999 / Accepted 3 December 1999


Theoretical spectral energy distributions were computed for a grid of hydrogen-deficient and carbon-rich model atmospheres of [FORMULA] in the range of 5000-6250 K and [FORMULA] by the technique of opacity sampling, taking into account continuous molecular band and atomic line absorption. These energy distributions were compared with the spectrum of V4334 Sgr (Sakurai's object) from April, 1997 in the wavelength interval 300-1000 nm. We show that (1) the shape of the theoretical spectra depends strongly on [FORMULA], but only very weakly on the hydrogen abundance; (2) the comparison of the observed and computed spectra permits us to estimate [FORMULA] [FORMULA] K for V4334 Sgr in April, 1997, and its interstellar reddening (plus a possible circumstellar contribution) [FORMULA].

Key words: stars: abundances – stars: atmospheres – stars: AGB and post-AGB – stars: individual: V 4334 Sgr

Send offprint requests to: Ya.V. Pavlenko

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© European Southern Observatory (ESO) 2000

Online publication: January 31, 2000